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So I made a previous post here, but nobody chimed in and I found out more information which might deserve a different thread since I can't edit the title. old thread http://atariage.com/forums/topic/277333-cx53-trak-ball-issues-jittery/ So I thought I had a Trak-Ball issue where it was jittery. I had changed just about everything in it; the dome buttons, all of the IC's, bearings, etc. Nothing seemed to help with it being jittery. I just got a NIB trak-ball from Venezuela. I plugged it in and nothing would move the cursor. I then swapped out IC A1 (LM339) and then I could get the cursor moving, but it was still jittery. I swapped out the rest of the IC's and still jittery even on the NIB one. I then thought this was too much of a coincidence and decided to dig out an old 4 port 5200 and hooked up the RF. I would have done this sooner, but I didn't think this was the cause and it's a pain. My other 2 port i had been using has really nice video with the S-video mod I put in. When I put the NIB trak-ball hooked up to the 4 port 5200 it works fine. The issue must be with the 2 port 5200. Anyway, what could be causing this issue with my 2 port 5200? Is there some kind of IC that is responsible for this?
I found a Trak-Ball that is serial number 00249, so I figured it'd be interesting to see what kind of serial numbers are out there. I asked the 5200 facebook group and a bunch of people there gave me the numbers off of their Trak-Balls. Please feel free to post your serial number and any interesting information, like Country of Manufacture and the EP codes. Or, any other code prefixes. Here's the list. https://docs.google.com/spreadsheets/d/1aOaXTLlwIG_rvisCZmIbVjZiZ8-MXtSo0AxY41u3-BU/edit?usp=sharing